Calculate the actual length of GBK and UTF8 strings implemented by JavaScript

Calculate the actual length of GBK and UTF8 strings implemented by JavaScript

The main purpose is to match the length range of the database. For example, if a field in the GBK database is varchar (10), the length is equivalent to five Chinese characters, and one Chinese character is equal to the length of two letters. For UTF8 databases, the length of each Chinese character is 3.

After learning the above principles, we can calculate the actual length of a string. If the GBK character set encounters a Chinese character plus 2, if the UTF8 Character Set encounters a Chinese character plus 3.

GBK length calculation function:

　　The Code is as follows:

// Calculate the actual length of the GBK character set

Function getStrLeng (str ){

Var realLength = 0;

Var len = str. length;

Var charCode =-1;

For (var I = 0; I <len; I ++ ){

CharCode = str. charCodeAt (I );

If (charCode> = 0 & charCode <= 128 ){

RealLength + = 1;

} Else {

// If it is Chinese, the length is increased by 2

RealLength + = 2;

}

}

Return realLength;

}

UTF8 length calculation function:

　　The Code is as follows:

// UTF8 character set actual length calculation

Function getStrLeng (str ){

Var realLength = 0;

Var len = str. length;

Var charCode =-1;

For (var I = 0; I <len; I ++ ){

CharCode = str. charCodeAt (I );

If (charCode> = 0 & charCode <= 128 ){

RealLength + = 1;

} Else {

// If it is Chinese, the length is increased by 3

RealLength + = 3;

}

}

Return realLength;

}